Design of atmospheric gas burners. . njectorwith the throat diameter that gave the greatest pressure was, ofcourse, the best injector. For the square inch port area, theone-half-inch diameter throat proved to be the best injector, yetfor the other burners it was the poorest. The five-eighths-inch 40 Technologic Papers of the Bureau of Standards diameter showed up best with the square inch port areaburner, while the three-fourths-inch diameter was best for boththe and square inch port area burners. From the curves of Fig. 17 it is possible to draw the curves inFig. 18; and f
Design of atmospheric gas burners. . njectorwith the throat diameter that gave the greatest pressure was, ofcourse, the best injector. For the square inch port area, theone-half-inch diameter throat proved to be the best injector, yetfor the other burners it was the poorest. The five-eighths-inch 40 Technologic Papers of the Bureau of Standards diameter showed up best with the square inch port areaburner, while the three-fourths-inch diameter was best for boththe and square inch port area burners. From the curves of Fig. 17 it is possible to draw the curves inFig. 18; and from these latter curves we can arrive at the relationbetween area of the injector throat and port area of the obtain curves that would show the comparative value of theinjectors with different throat diameters, it was necessary toselect a constant gas rate and plot the pressure in the burner forthe different diameters against the port area of the burner. Thishas been done for two different gas rates in Fig. 18. This figure. 40 so &3 to 80 Rate-Cubic Feet per Hour Fig. 17.—Pressures in burners of different port areas fitted to injectors of different flow capacities These curves were determined from the maximum values taken from curves in which those of Fig. 16are included. Pressures developed by gas flowing through orifice at 4 inches water pressure indicates at a glance which diameter is the best for the differentport areas. It should also be noted that the curves for the twogas rates are exactly alike, which is to be expected. A study ofthe curves for either gas rate shows, for instance, that the one-halfand five-eighths inch throat diameter are equally good injectorsfor a port area of square inch, and that the five-eighths andthree-fourths inch throat diameter are equally good at squareinch port area, because in each case the pressure in the burnerwould be equal. It would seem from the intersection of the curves of Fig. 18 thatthe five-eighths-inch throa
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